Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1981-07-07
1984-03-06
Helfin, Bernard
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568424, 568706, 568746, 568764, 568765, 568766, 568649, 568650, 568651, 568771, C07C 4564
Patent
active
044356013
ABSTRACT:
Optionally aldehyde substituted polyphenols are prepared by oxidizing, with hydrogen peroxide, a hydroxybenzaldehyde bearing at least one aldehyde substituent ortho- and/or para- to the nuclear hydroxyl group, in an aqueous reaction medium and in the presence of an alkali or alkaline earth metal base, the process being characterized in that the pH of the reaction medium is continuously maintained at a value no greater than 7 throughout the course of the oxidation reaction.
The subject process is well suited for the preparation of, e.g., hydroxy-p-vanillin from guaiacol, and the novel compound 2,4,6-triformylphenol.
REFERENCES:
patent: 1891149 (1932-12-01), Elger
patent: 1965458 (1934-07-01), Elger
patent: 4119671 (1978-10-01), Bauer et al.
patent: 4190605 (1980-02-01), Muench et al.
patent: 4205188 (1980-05-01), Muench et al.
Patai, The Chemistry of the Carbonyl Group (1966), 749-753, 758-759.
Martin, J.A.C.S., vol. 74, (1952), 3024-3025.
Freeman et al., J.A.C.S., vol. 76, (1954), 2080-2087.
Formanek Karel
Michelet Daniel
Petre Dominique
Helfin Bernard
Rhone-Poulenc Industries
LandOfFree
Preparation of polyphenols by oxidation of hydroxybenzaldehydes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Preparation of polyphenols by oxidation of hydroxybenzaldehydes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preparation of polyphenols by oxidation of hydroxybenzaldehydes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-742891